Chevrolet 2003 Venture Owner's Manual page 79

You'll be using the lap-shoulder belt. See Top Strap
on
page 1-66 if the child restraint has a top strap or top
tether. Be sure to follow the instructions that came with
the child restraint, Secure the child in the child
restraint when and as the instructions say.
1. Put the restraint on the seat.
2. Pick up the latch plate, and run the lap and shoulder
portions of the vehicle's safety belt through or
around the restraint. The child restraint instructions
will show you how.
Third Row Outside
Passenger
Position
In the third row, tilt the latch plate to adjust the belt
if needed.
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